The open-source wrapper most publishers use to manage header bidding. It coordinates multiple demand partners, runs the auction, and passes the winning bid to the ad server. Because it is open source, the community maintains it and the code is auditable. That transparency is the point. When you are wondering why a demand partner's bids are or are not coming through, the Prebid configuration is usually where the investigation starts.
Ad tech glossary
Prebid
Technical definition
An open-source header bidding wrapper that manages multiple demand partners' bids before making calls to the ad server.
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